摘要
选用同时含苯环和C-N结构的有机物苯甲酰胺样品为实验对象,制备不同含氮量的样品并进行激光诱导击穿光谱实验;在不同气体环境(空气、氩气)和激光能量条件下,研究了有机物中N元素的激发特性,建立了N元素光谱信息与N元素含量之间的关联性.结果表明:在氩气环境中,含N元素样品的N原子谱线较难被探测到N,该结果说明在大气环境中探测到的N原子谱线主要源于空气中N的激发(空气中有79%的N2);在空气或氩气条件下,均能探测到较强的CN分子光谱,且与样品中N元素含量有一定的关联性,这种关联性不仅与气体环境有关还与激光能量有关;在氩气条件下,由于CN分子光谱的形成完全来源于样品,不管在低能量还是高能量条件下,均与N元素含量具有较高的相关性;在大气环境中,在低能量条件下,关联性较好(R2高于0.9),而高能量条件下,关联性较差,说明在低能量条件下,空气环境中探测到的CN主要来源于样品本身,而在高能量条件下CN分子光谱的形成受环境中氮气的影响较大.
To choose the organic material benzamide containing benzene ring and the C-N structure as a model sample, the samples with different nitrogen content were prepared for the Laser-Induced Breakdown Spectroscopy （LTBS） experiment. The experiments were performed under different atmospheres （air and argon） to study the influence of atmosphere on the excitation characteristics of nitrogen in organic materials with different laser energy, then the correlation between nitrogen spectral information and N concentration was established. The results show that, under the air condition, the spectral lines of atomic N of the samples are difficult to be detected, which indicates that the spectral lines of atomic N detected in the atmospheric environmentis mainly from the emision of atomic N contained in air （79% Nz in air）. Under the condition of air or argon atmosphere, the molecular CN emission can be both detected and there exists a correlation relationship between the CN emission and N concentration, which is related to the atmosphere and laser energy. Under the conditon of argon, the good correlation relationship exeists both under low and high laser energy due to the formation of CN is from the sample. Under the condition of air, environment there is a good correlation relationship under a lower ener^v but less .nder n hitTh enertrv （R2 hierht^r than D q ）. ,xrhieh ;nAir,~t,~ tl^t_ in airenvironment, the CN is mainly from the sample under the low energy while the high laser energy causes the formation of CN strongly influenced by nitrogen in the air.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2016年第10期161-166,共6页
Acta Photonica Sinica
基金
国家自然科学基金(Nos.51476061
51406059)
华南理工大学中央高校基本科研业务费专项资金(No.2015ZM002)资助~~
关键词
光谱学
激光诱导击穿光谱
CN分子光谱
非金属元素
N元素
Spectroscopy
Laser-induced breakdown spectroscopy
CN molecular
Non-metallic element
Nitrogen
